Laser unit and laser encoder system
A polarisation rotator in the laser unit addresses backscattered light interference, stabilizing the laser frequency and enhancing the reliability of laser encoder systems.
WO2026132829A1PCT designated stage Publication Date: 2026-06-25RENISHAW PLC
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- RENISHAW PLC
- Filing Date
- 2025-12-18
- Publication Date
- 2026-06-25
AI Technical Summary
Technical Problem
Existing laser encoder systems face instability due to backscattered light affecting the frequency stabilization mechanism, leading to potential destabilization of the laser source.
Method used
Incorporating a polarisation rotator, such as a Faraday rotator, to rotate the polarization state of backscattered light, diverting it away from the frequency stabilization unit, thereby reducing interference and maintaining laser frequency stability.
Benefits of technology
The solution effectively minimizes the impact of backscattered light on the frequency stabilization unit, ensuring consistent laser beam frequency and improved system performance.
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Smart Images
Figure GB2025060053_25062026_PF_FP_ABST
Abstract
A laser unit (2) is disclosed which comprises: a laser source (50) for producing a laser beam (51) along a beam path; a frequency stabilisation unit (65) which receives a portion of light from the laser source (50) to enable it to stabilise the frequency of the laser beam (51); at least one optical component (F1, F2) in the beam path which produces undesirable back scattered light in use; and a polarisation rotator (66) arranged in the beam path for rotating the polarisation of the back scattered light relative to the polarisation of light in the laser beam (51) to reduce the effect of the back scattered light on the operation of the frequency stabilisation unit (65). A laser encoder system is also disclosed which uses such a laser unit (2).
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